family Compositae vs genus Arnica

family Compositae and genus Arnica both are nouns.

Word	Noun	Adjective	Verb	Adverb
family Compositae	Yes	No	No	No
genus Arnica	Yes	No	No	No

family Compositae (noun)	genus Arnica (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	large genus of herbs of north temperate and Arctic regions